利用空化喷咀来产生“空泡”是获得“空化水射流”的简便方法.Some jets pulsed jet , cavitating jet, abrasive water jet are introduced.磨料水射流的性能主要取决于磨料颗粒的冲击速度.The performance of abrasive waterjet depends on the impact velocity of abrasive.在低速射流的预混火焰和扩散火焰...
男孩子们对我不感兴趣令我很烦恼。It bothered me that boys weren't interested in me.我和她互相倾诉烦恼。She tells me her troubles. I tell her mine.很多答案都不准确，为此他感到很烦恼。He was disturbed by the inaccuracy of the answers....